linux-kernel - Re: [PATCH v2 12/15] drm/mediatek: mtk_hdmi: Split driver and add common probe function

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Message-ID: <47a462d2fe848d3d23811a554516bec1b0424821.camel@mediatek.com>
Date: Fri, 13 Dec 2024 08:43:57 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "robh@...nel.org" <robh@...nel.org>, "jie.qiu@...iatek.com"
	<jie.qiu@...iatek.com>, "tzimmermann@...e.de" <tzimmermann@...e.de>,
	"simona@...ll.ch" <simona@...ll.ch>, "mripard@...nel.org"
	<mripard@...nel.org>, Jitao Shi (石记涛)
	<jitao.shi@...iatek.com>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>, "dri-devel@...ts.freedesktop.org"
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	<matthias.bgg@...il.com>, "junzhi.zhao@...iatek.com"
	<junzhi.zhao@...iatek.com>
Subject: Re: [PATCH v2 12/15] drm/mediatek: mtk_hdmi: Split driver and add
 common probe function

Hi, Angelo:

On Thu, 2024-12-05 at 12:45 +0100, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> In preparation for adding a new driver for the HDMI TX v2 IP,
> split out the functions that will be common between the already
> present mtk_hdmi (v1) driver and the new one.
> 
> Since the probe flow for both drivers is 90% similar, add a common
> probe function that will be called from each driver's .probe()
> callback, avoiding lots of code duplication.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---

[snip]

> +static int mtk_hdmi_probe(struct platform_device *pdev)
> +{
> +       struct mtk_hdmi *hdmi;
> 
> -       ret = mtk_hdmi_clk_enable_audio(hdmi);
> -       if (ret) {
> -               drm_bridge_remove(&hdmi->bridge);
> -               return dev_err_probe(dev, ret,
> -                                    "Failed to enable audio clocks\n");
> -       }
> +       hdmi = mtk_hdmi_common_probe(pdev);
> +       if (IS_ERR(hdmi))
> +               return PTR_ERR(hdmi);

In original v1 driver, update_plugged_status_lock is init in probe.
I can not find the init in this patch.
It's better that moving common code seldom change the order in a function,
so you could easily to compare that moving does not change any thing.
In this patch, you not only moving code, but also change the order in a function,
so it's not easy to find something lost.

That's why I like you to separate this patch into two patches. One is adding version config and the other one is moving common code.
When I review the moving common code part, I would like a function before moving is almost same as after moving,
so it's easy to find out something lost.

Regards,
CK

> 
> -       return 0;
> +       return mtk_hdmi_clk_enable_audio(hdmi);
>  }
> 

[snip]

> +struct mtk_hdmi *mtk_hdmi_common_probe(struct platform_device *pdev)
> +{
> +       const struct mtk_hdmi_ver_conf *ver_conf;
> +       struct device *dev = &pdev->dev;
> +       struct mtk_hdmi *hdmi;
> +       int ret;
> +
> +       hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
> +       if (!hdmi)
> +               return ERR_PTR(-ENOMEM);
> +
> +       hdmi->dev = dev;
> +       hdmi->conf = of_device_get_match_data(dev);
> +       ver_conf = hdmi->conf->ver_conf;
> +
> +       hdmi->clk = devm_kcalloc(dev, ver_conf->num_clocks, sizeof(*hdmi->clk), GFP_KERNEL);
> +       if (!hdmi->clk)
> +               return ERR_PTR(-ENOMEM);
> +
> +       hdmi->phy = devm_phy_get(dev, "hdmi");
> +       if (IS_ERR(hdmi->phy))
> +               return dev_err_cast_probe(dev, hdmi->phy, "Failed to get HDMI PHY\n");
> +
> +       ret = mtk_hdmi_dt_parse_pdata(hdmi, pdev, ver_conf->mtk_hdmi_clock_names,
> +                                     ver_conf->num_clocks);
> +       if (ret)
> +               return ERR_PTR(ret);
> +
> +       platform_set_drvdata(pdev, hdmi);
> +
> +       ret = mtk_hdmi_register_audio_driver(dev);
> +       if (ret)
> +               return dev_err_ptr_probe(dev, ret, "Cannot register HDMI Audio driver\n");
> +
> +       hdmi->bridge.funcs = ver_conf->bridge_funcs;
> +       hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
> +       hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
> +       hdmi->bridge.of_node = pdev->dev.of_node;
> +
> +       ret = devm_drm_bridge_add(dev, &hdmi->bridge);
> +       if (ret)
> +               return dev_err_ptr_probe(dev, ret, "Failed to add bridge\n");
> +
> +       return hdmi;
> +}
> +